Estimation of the Clutch Characteristic Map for Wet Clutch Transmissions Considering Actuator Signal and Clutch Slip

摘要

The wet dual clutch transmission is an essential part of the powertrain in modern high-power engine vehicles. This clutch is a complex mechatronic system which has high requirements on control to provide comfort, sportiness and economy. Many control concepts use clutch characteristics in control. To fulfil the demands of the costumer a high quality of the estimated clutch behaviour is necessary. This paper introduced a new approach to estimate the clutch characteristic map of an automated wet clutch as a function of the actuator signal and the clutch slip. The identification of the characteristic map is based on the clutch characteristic of the relation between the actuator signal and the transferred clutch torque. The information of this characteristic is used to calculate the slope of the characteristic map. This slope can be used to identify the slip influence on the clutch torque. The identification results in two separate characteristics, which can be combined to a characteristic map to describe the clutch behaviour with a static characteristic map. The advantage of this approach is the usability of the clutch characteristic with and without the slip influence. This paper shows the results of this identification and the improvement of using the three-dimensional characteristic map instead of the two-dimensional clutch characteristic. The results of the introduced approach are shown in an example with data of a wet dual clutch.